From the point of view of a developer, maintaining a codebase that works across the different distros is harder than maintaining the macos/windows counterpart. Most developers end up choosing between official releases with bundled libraries or leaving official releases for win/mac and delegating the package for each distro maintainer.
From the point of view of an user, that doesn't matter. But remember if you find a bug on a specific distro talk to the package maintainer or try to reproduce on official releases, if available, before bothering software developers.
Regarding the 32bit shutdown on Catalina and the notarization of apps: apple is playing stupid games to force an IOSification of macos. They enabled gatekeeper and SIP before but they're not enforcing them, so the people can choose, for now.
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